/*-
 * Public platform independent Near Field Communication (NFC) library examples
 *
 * Copyright (C) 2009, Roel Verdult
 * Copyright (C) 2010, Romuald Conty, Romain Tartière
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *  1) Redistributions of source code must retain the above copyright notice,
 *  this list of conditions and the following disclaimer.
 *  2 )Redistributions in binary form must reproduce the above copyright
 *  notice, this list of conditions and the following disclaimer in the
 *  documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 * Note that this license only applies on the examples, NFC library itself is under LGPL
 *
 */
/**
 * @file mifare.c
 * @brief provide samples structs and functions to manipulate MIFARE Classic and Ultralight tags using libnfc
 */
#include "mifare.h"
#include "errors.h"

#include <string.h>

#include <nfc/nfc.h>

/**
 * @brief Execute a MIFARE Classic Command
 * @return Returns true if action was successfully performed; otherwise returns false.
 * @param pmp Some commands need additional information. This information should be supplied in the mifare_param union.
 *
 * The specified MIFARE command will be executed on the tag. There are different commands possible, they all require the destination block number.
 * @note There are three different types of information (Authenticate, Data and Value).
 *
 * First an authentication must take place using Key A or B. It requires a 48 bit Key (6 bytes) and the UID.
 * They are both used to initialize the internal cipher-state of the PN53X chip (http://libnfc.org/hardware/pn53x-chip).
 * After a successful authentication it will be possible to execute other commands (e.g. Read/Write).
 * The MIFARE Classic Specification (http://www.nxp.com/acrobat/other/identification/M001053_MF1ICS50_rev5_3.pdf) explains more about this process.
 */
bool
nfc_initiator_mifare_cmd(nfc_device *pnd, const mifare_cmd mc, const uint8_t ui8Block, mifare_param *pmp) {
	uint8_t  abtRx[265];
	size_t  szParamLen;
	uint8_t  abtCmd[265];
	//bool    bEasyFraming;

	abtCmd[0] = mc;               // The MIFARE Classic command
	abtCmd[1] = ui8Block;         // The block address (1K=0x00..0x39, 4K=0x00..0xff)

	switch (mc) {
			// Read and store command have no parameter
		case MC_READ:
		case MC_STORE:
			szParamLen = 0;
			break;

			// Authenticate command
		case MC_AUTH_A:
		case MC_AUTH_B:
			szParamLen = sizeof(struct mifare_param_auth);
			break;

			// Data command
		case MC_WRITE:
			szParamLen = sizeof(struct mifare_param_data);
			break;

			// Value command
		case MC_DECREMENT:
		case MC_INCREMENT:
		case MC_TRANSFER:
			szParamLen = sizeof(struct mifare_param_value);
			break;

			// Please fix your code, you never should reach this statement
		default:
			return false;
			break;
	}

	// When available, copy the parameter bytes
	if (szParamLen)
		memcpy(abtCmd + 2, (uint8_t *) pmp, szParamLen);

	// FIXME: Save and restore bEasyFraming
	// bEasyFraming = nfc_device_get_property_bool (pnd, NP_EASY_FRAMING, &bEasyFraming);
	if (nfc_device_set_property_bool(pnd, NP_EASY_FRAMING, true) < 0) {
		nfc_perror(pnd, ERROR_NFC_DEVICE_SET_PROPERTY_BOOL_FRAMING);
		return false;
	}
	// Fire the mifare command
	int res;
	if ((res = nfc_initiator_transceive_bytes(pnd, abtCmd, 2 + szParamLen, abtRx, sizeof(abtRx), -1))  < 0) {
		if (res == NFC_ERFTRANS) {
			// "Invalid received frame",  usual means we are
			// authenticated on a sector but the requested MIFARE cmd (read, write)
			// is not permitted by current acces bytes;
			// So there is nothing to do here.
		} else if (res == NFC_ETGRELEASED) {
			// If AUTH_* command fails, returned error is NFC_ETGRELEASED
			// So there is nothing to do here. (don't hurt the user ;-))
		} else {
			nfc_perror(pnd, ERROR_NFC_INITIATOR_TRANSCEIVE_BYTES);
		}
		// XXX nfc_device_set_property_bool (pnd, NP_EASY_FRAMING, bEasyFraming);
		return false;
	}
	/* XXX
	if (nfc_device_set_property_bool (pnd, NP_EASY_FRAMING, bEasyFraming) < 0) {
	  nfc_perror (pnd, ERROR_NFC_DEVICE_SET_PROPERTY_BOOL_FRAMING);
	  return false;
	}
	*/

	// When we have executed a read command, copy the received bytes into the param
	if (mc == MC_READ) {
		if (res == 16) {
			memcpy(pmp->mpd.abtData, abtRx, 16);
		} else {
			return false;
		}
	}
	// Command succesfully executed
	return true;
}
